CN115149082A - Lithium ion battery and assembling method thereof - Google Patents
Lithium ion battery and assembling method thereof Download PDFInfo
- Publication number
- CN115149082A CN115149082A CN202210733597.5A CN202210733597A CN115149082A CN 115149082 A CN115149082 A CN 115149082A CN 202210733597 A CN202210733597 A CN 202210733597A CN 115149082 A CN115149082 A CN 115149082A
- Authority
- CN
- China
- Prior art keywords
- plate
- negative pole
- cover plate
- shell
- winding core
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 38
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000004804 winding Methods 0.000 claims abstract description 62
- 238000005096 rolling process Methods 0.000 claims abstract description 4
- 238000003466 welding Methods 0.000 claims description 51
- 238000007789 sealing Methods 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 12
- 239000003792 electrolyte Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000012212 insulator Substances 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 description 7
- 238000004146 energy storage Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to the technical field of new energy automobiles and lithium ion batteries, and discloses a lithium ion battery and an assembling method thereof; the lithium ion battery of the invention comprises a shell, a roll core, an anode cover plate and a cathode cover plate, one end of the shell is provided with a fixing plate, and the center of the fixing plate is provided with a through hole; the positive cover plate is arranged at an opening at one end of the shell provided with the fixing plate; the winding core is arranged in the shell, a central hole is formed in the winding core, and a current collecting disc of the positive electrode of the winding core is welded and connected with one surface, far away from the positive electrode cover plate, of the fixing plate; the opening part of fixed plate one end is kept away from at the casing to the negative pole apron setting, and the center department of negative pole apron is equipped with negative pole post, and one of negative pole post locating in the casing is served and is equipped with the guide plate, and the one side and the negative pole post welded connection of guide plate, the another side of guide plate and the current collector dish welded connection of the negative pole of rolling up the core. The battery does not need a folding conductive connecting piece, and the difficulty of battery assembly and the risk of short circuit are reduced.
Description
Technical Field
The invention relates to the technical field of new energy automobiles and lithium ion batteries, in particular to a lithium ion battery and an assembling method thereof.
Background
A lithium ion battery is a secondary battery (rechargeable battery) that mainly works by moving lithium ions between a positive electrode and a negative electrode, and is widely used in various working situations. The cylindrical lithium ion battery becomes a power source commonly used by plug-in hybrid drive and pure electric drive new energy vehicles by virtue of the advantages of easy manufacture and the like in structure. Meanwhile, the cylindrical lithium ion battery is also a common battery structure in the energy storage application market, and is used in the scenes of household energy storage, motor home energy storage, large-scale industrial energy storage and the like.
The traditional lithium ion batteries are 18650, 21700 and the like, and a single-pole lug mode is mostly adopted to connect a winding core and a battery electrode. The tab is mostly a slender thin sheet type conductor and is a main adverse factor influencing the internal resistance and the heat generation of the battery. With the increasing requirements of new energy automobiles on energy density and output power of batteries, large cylindrical lithium ion batteries become the development trend of cylindrical batteries, and meanwhile, the tabs need to bear larger current and release more heat, so that the tabs become the key influencing the safety of the batteries. In addition, there are lithium ion battery winding cores with "no-tab" or "full-tab" structures, and cover plates (or "current collecting plates") are usually disposed at two ends of the winding core. Because some cell shells are of cylinder structures with openings at two ends, the two ends are respectively provided with the positive cover plate and the negative cover plate, the corresponding electrodes need to be connected with the current collecting discs of two poles of the winding core through the conductive connecting pieces, and in order to adapt to the distance error between the current collecting discs and the electrodes, the conductive connecting pieces are usually of a folding structure, occupy a larger space in the cell shells, and restrict the volume of the winding core and the energy density of the battery. The conductive connecting piece is required to be folded when the positive cover plate and the negative cover plate are installed, the operation is complex, and meanwhile, the conductive connecting piece connected with the negative electrode is folded and assembled, so that the shell wall and the battery core are easily collided to cause short circuit, and the safety of the battery is influenced. Meanwhile, there is a need for improvement in the structure of the cylindrical lithium ion battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the lithium ion battery which does not need a folding conductive connecting piece, and reduces the difficulty of battery assembly and the risk of short circuit.
In order to achieve the purpose, the lithium ion battery comprises a shell, a winding core, an anode cover plate and a cathode cover plate, wherein the shell is in a cylindrical shape with openings at two ends;
the positive cover plate is arranged at an opening of one end of the shell, which is provided with the fixing plate, and the positive cover plate is welded with the periphery of the corresponding opening of the shell;
the winding core is arranged in the shell, a central hole is formed in the winding core, the central hole penetrates through the current collecting discs at two poles of the winding core, and the current collecting disc at the positive pole of the winding core is welded and connected with one surface, far away from the positive pole cover plate, of the fixing plate;
the negative pole cover plate sets up the casing is kept away from the opening part of fixed plate one end, the negative pole cover plate with the casing corresponds the peripheral welded connection of open-ended, the center department of negative pole cover plate is equipped with negative pole post, negative pole post with the negative pole cover plate is insulating to be set up, negative pole post's one end is located in the casing, negative pole post's the other end runs through the negative pole cover plate is located outside the casing, negative pole post locates one in the casing is served and is equipped with the guide plate, the one side of guide plate with negative pole post welded connection, the another side of guide plate with the current collector dish welded connection of the negative pole of rolling up the core.
In one embodiment, the deflector is made of an elastic metal conductive material.
In one embodiment, a mounting hole is formed in the center of the negative electrode cover plate, and the mounting hole penetrates through the negative electrode cover plate; the negative pole post comprises a negative pole pressing plate and a conductive rivet, the negative pole pressing plate is arranged on the outer side of the negative pole cover plate, an insulating part is arranged between the negative pole pressing plate and the negative pole cover plate, an insulating sealing part is arranged on the inner side of the negative pole cover plate, and the insulating sealing part penetrates through the mounting hole and is connected with the insulating part; conductive rivet runs through in proper order insulating sealing member the mounting hole reaches the insulating member with the riveting of negative pole clamp plate, the one side of guide plate with conductive rivet welded connection, the another side of guide plate with the current collection dish welded connection of the negative pole of roll up the core.
In one embodiment, a boss is arranged on one surface of the insulating sealing member close to the negative electrode cover plate, the boss penetrates through the mounting hole and is inserted into the insulating member, the conductive rivet penetrates through one surface of the insulating sealing member far away from the negative electrode cover plate, and the end surface of one end of the boss inserted into the insulating member is connected with the negative electrode pressing plate.
In one embodiment, the end of the boss inserted into the insulator has an interference fit with the insulator and the mounting hole, and the conductive rivet has an interference fit with the insulating seal.
In one embodiment, the one side that the guide plate is close to electrically conductive rivet is equipped with first bulge, first bulge with electrically conductive rivet welded connection, the one side that the guide plate deviates from electrically conductive rivet is equipped with the second bulge, the second bulge with the current collector dish welded connection of rolling up the core negative pole.
In one embodiment, one surface of the fixing plate, which faces away from the positive cover plate, is provided with an annular groove and a plurality of concave parts, the annular groove is concentric with the fixing plate and is arranged at the joint of the fixing plate and the shell, and the concave parts are arranged in an area surrounded by the annular groove and are arranged at intervals around the center of the fixing plate.
In one embodiment, a gap is provided between two adjacent surfaces of the positive cover plate and the fixed plate, the positive cover plate is provided with a liquid injection hole and a sealing cover capable of sealing the liquid injection hole, and the recessed portion is provided through the fixed plate.
The lithium ion battery in the above embodiment has at least the following advantages:
(1) The positive cover plate is connected with the positive current collecting disc of the roll core through the shell and the fixing plate, the negative pole column is connected with the current collecting disc of the negative pole of the roll core through the flow guide plate, the use of a folding conductive connecting piece is avoided in the whole structure, and the difficulty of battery assembly and the risk of short circuit are reduced. The guide plate can be welded with the negative current collecting disc and then welded and connected with the negative pole post through the through hole at the center of the fixing plate and the central hole on the winding core; meanwhile, the fixing plate and the guide plate are directly welded with the current collecting disc of the winding core, so that the position fixing effect of the winding core in the shell is better; meanwhile, the assembling process can be simplified, the space occupation of the throttling structure in the electric core shell can be reduced, and the energy density of the battery can be improved.
(2) The guide plate is made of elastic metal conductive materials, so that the guide plate is conveniently connected with the roll core cathode current collecting disc, the cathode pole column and the conductive rivet, and the guide plate can generate certain deformation to adapt to the distance error between the conductive rivet and the roll core cathode current collecting disc. The bosses of the conductive rivet and the insulating sealing element and the bosses of the insulating sealing element are in interference fit with the mounting holes simultaneously, interference between the insulating sealing element and the mounting holes can be increased after the conductive rivet is mounted, and mounting difficulty of the insulating sealing element can be reduced under the condition of ensuring the interference.
(3) The first convex part, the second convex part, the annular groove and the concave part enable a gap to be formed between the winding core and the local areas of the guide plate and the fixing plate, so that the welding is convenient, and the electrolyte can flow after being injected. A gap is arranged between the positive electrode cover plate and the fixing plate so as to facilitate the injection of electrolyte.
Aiming at the lithium ion battery in the embodiment, the invention also provides an assembly method of the lithium ion battery, which comprises the following steps:
s1: fixing a fixing plate in one end of a shell by welding or integral forming, then putting a winding core from the other end of the shell, and welding and connecting the fixing plate and a current collecting disc of the anode of the winding core by laser spot welding;
s2: the guide plate is arranged in the shell, and the guide plate is welded and fixed on the negative current collecting disc of the winding core through laser spot welding;
s3: mounting the negative pole post on a negative pole cover plate, mounting the negative pole cover plate on one end of the shell far away from the fixed plate, and welding and connecting the guide plate and the negative pole post by using resistance welding through a central hole on the winding core;
s4: and installing a positive cover plate and injecting electrolyte, wherein the positive cover plate is connected with the shell through welding.
Further, the step S3 includes the step of welding the negative electrode cover plate to the housing, and then clamping the guide plate and the negative electrode pole by the upper and lower electrodes of the resistance welding machine to perform welding.
The method for assembling the lithium ion battery in the above embodiment has at least the following advantages:
(1) The anode cover plate and the cathode cover plate do not need to be separately assembled and welded, the fixing plate and the current collecting disc of the anode of the roll are welded firstly, and then the guide plate and the cathode current collecting disc of the roll are welded, so that the fixing plate and the guide plate can be conveniently controlled to be tightly attached to the corresponding current collecting discs, and the welding quality is ensured. The guide plate and the cathode pole are welded through resistance welding, so that the guide plate and the cathode pole are tightly attached in the welding process, and empty welding is avoided. The battery assembling process is simplified, and the production efficiency is improved.
(2) Welding the negative electrode cover plate on the shell, welding the guide plate and the negative electrode pole column to facilitate welding the negative electrode cover plate, and reducing the influence of the negative electrode cover plate on the welding of the guide plate.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings, which are required to be used in the embodiments, will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to actual scale.
Fig. 1 is a front cross-sectional view of a lithium ion battery according to an embodiment of the present invention;
fig. 2 is an enlarged view a of the lithium ion battery shown in fig. 1;
fig. 3 is a B enlarged view of the lithium ion battery shown in fig. 1;
FIG. 4 is a schematic perspective view of the housing shown in FIG. 1;
fig. 5 is a schematic perspective view of the baffle of fig. 1;
reference numerals:
1-shell, 11-fixing plate, 111-through hole, 112-annular groove, 113-depressed part, 2-positive cover plate, 21-liquid injection hole, 22-sealing cover, 3-negative cover plate, 31-mounting hole, 32-negative pole post, 321-negative pressure plate, 322-conductive rivet, 33-insulating part, 34-insulating sealing part, 341-boss, 4-winding core, 41-central hole, 5-guide plate, 51-first bulge, 52-second bulge and 53-liquid passing hole.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby. It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.
In the description of the present application, it is to be understood that the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are intended to be inclusive and mean that, for example, they may be fixedly connected or detachably connected or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 5, the lithium ion battery according to one embodiment includes a case 1, a positive cover plate 2, a negative cover plate 3, and a winding core 4, which does not require a folded conductive connecting member, thereby reducing the difficulty of battery assembly and the risk of short circuit.
Specifically, referring to fig. 1 to 3, the housing 1 is cylindrical with two open ends. One end of the shell 1 is provided with a fixing plate 11, and the fixing plate 11 is arranged in the shell 1 near the corresponding end opening. The periphery of the fixing plate 11 is fixedly connected with the inner wall of the cylindrical barrel in a conductive manner. A through hole 111 is provided at the center of the fixing plate 11. The positive cover plate 2 is arranged at an opening of the shell 1 at one end provided with the fixing plate 11. The positive cover plate 2 is welded with the periphery of the corresponding opening of the shell 1. The positive electrode cover 2 and the case 1 constitute a positive electrode terminal structure of the battery. The fixing plate 11 may be integrally formed with the housing 1 or may be disposed in the housing 1 by welding or the like.
The winding core 4 is disposed in the casing 1. The winding core 4 is provided with a central hole 41, and the central hole 41 penetrates through the current collecting discs of the two poles of the winding core 4. The positive electrode current collecting disc of the winding core 4 is welded and connected with one surface of the fixing plate 11 far away from the positive electrode cover plate 2. The winding core 4 is a battery winding core formed by winding a positive plate, a negative plate and a diaphragm. Current collecting discs corresponding to the positive electrode and the negative electrode are arranged at two ends of the winding core 4, namely, the current collecting discs adopt a current collecting body structure of a battery winding core structure without lugs or right lugs and the like, and refer to the prior art. The central hole 41 is formed by crimping or by providing a central tube in the center of the reeling core 4. The center hole 41 is coaxially disposed with the through hole 111. Referring to fig. 4, in particular, a side of the fixing plate 11 facing away from the positive electrode cover plate 2 is provided with an annular groove 112 and a plurality of recessed portions 113. The annular groove 112 is concentrically arranged with the fixing plate 11 and is provided at the junction of the fixing plate 11 and the housing 1. The recesses 113 are provided in the area enclosed by the annular groove 112 and are spaced around the center of the fixing plate 11. The current collecting disc of the positive electrode of the winding core 4 is welded with the interval area between the annular groove 112 and the concave part 113, the structure is simple, the conductive area is large, and large current can be borne. Gaps are formed between the concave part 113 and the annular groove 112 and the positive current collecting disc of the winding core 4, and electrolyte can flow conveniently. In one embodiment, a gap is provided between the two surfaces of the positive electrode cover plate 2 and the fixing plate 11 that are close to each other. The positive electrode lid plate 2 is provided with a liquid inlet 21 and a sealing lid 22 capable of sealing the liquid inlet 21. The recess 113 is provided through the fixing plate 11. The injection hole 21 is used for injecting the battery electrolyte, and the concave part 113 penetrates through the fixing plate 11 to facilitate the electrolyte to flow into the winding core 4. Specifically, the recesses 113 are uniformly spaced around the through-hole 111. In one embodiment, the recess 113 is in the shape of a sector or a sector ring.
The negative cover plate 3 is arranged at an opening at one end of the shell 1 far away from the fixing plate 11. The negative electrode cover plate 3 is welded and connected with the periphery of the corresponding opening of the shell 1. The center of the negative electrode cover plate 3 is provided with a negative electrode post 32, and the negative electrode post 32 and the negative electrode cover plate 3 are arranged in an insulating way. One end of the cathode post 32 is disposed in the casing 1, and the other end of the cathode post 32 penetrates the cathode cover 3 and is disposed outside the casing 1. The end of the cathode pole 32 arranged in the shell 1 is provided with a guide plate 5. One surface of the guide plate 5 is welded with the cathode pole 32, and the other surface of the guide plate 5 is welded with the current collecting disc of the cathode of the winding core 4. The positive cover plate 2 is connected with the positive current collecting disc of the roll core 4 through the shell 1 and the fixing plate 11, the negative pole 32 is connected with the current collecting disc of the negative pole of the roll core 4 through the flow guide plate 5, the use of a folding conductive connecting piece is avoided in the whole structure, and the difficulty of battery assembly and the risk of short circuit are reduced. Through the through hole 111 at the center of the fixing plate 11 and the central hole 41 on the winding core 4, the guide plate 5 can be welded with the negative electrode current collecting disc and then welded with the negative electrode post 32; meanwhile, the fixing plate 11 and the guide plate 5 are directly welded with the current collecting disc of the winding core 4, so that the position fixing effect of the winding core 4 in the shell 1 is better; meanwhile, the assembling process can be simplified, the occupation of the current collecting structure to the space in the battery cell shell 1 can be reduced, and the energy density of the battery can be improved.
In one embodiment, the negative electrode cover 3 has a mounting hole 31 at the center. The mounting hole 31 penetrates the negative electrode lid plate 3. The negative electrode post 32 includes a negative electrode pressing plate 321 and a conductive rivet 322. The negative electrode pressing plate 321 is disposed outside the negative electrode lid plate 3, and an insulating member 33 is disposed between the negative electrode pressing plate 321 and the negative electrode lid plate 3. The inside of the negative electrode lid plate 3 is provided with an insulating seal 34, and the insulating seal 34 is connected to the insulating member 33 through the mounting hole 31. The conductive rivet 322 penetrates the insulating seal 34, the mounting hole 31, and the insulating member 33 in this order, and is riveted to the negative electrode pressure plate 321. One surface of the guide plate 5 is welded with the conductive rivet 322, and the other surface of the guide plate 5 is welded with the current collecting disc of the cathode of the winding core 4. Specifically, a boss 341 is provided on a surface of the insulating seal 34 close to the negative electrode lid plate 3. The boss 341 penetrates the mounting hole 31 and is inserted into the insulator 33. The conductive rivet 322 penetrates through one surface of the insulating seal 34 far away from the negative electrode lid plate 3, and the end surface of the boss 341 inserted into the insulating member 33 is connected to the negative electrode pressing plate 321. In one embodiment, the end of the boss 341 inserted into the insulator 33 is interference fit with the insulator 33 and the mounting hole 31, and the conductive rivet 322 is interference fit with the insulating seal 34. After the conductive rivet 322 is installed, the interference between the insulating seal 34 and the installation hole 31 can be increased, and the interference between the insulating seal 34 and the insulating member 33 can be increased, so that the installation difficulty of the insulating seal 34 can be reduced under the condition of ensuring the interference.
Referring to fig. 5, in one embodiment, a first protrusion 51 is disposed on a surface of the baffle 5 close to the conductive rivet 322, and the first protrusion 51 is connected to the conductive rivet 322 by welding. The side of the flow guide plate 5 departing from the conductive rivet 322 is provided with a second protruding part 52, and the second protruding part 52 is welded with the current collecting plate of the cathode of the winding core 4. The first and second protrusions 51 and 52 and the annular and recessed grooves 112 and 113 form a gap between the winding core 4 and the local areas of the baffle 5 and the fixing plate 11, so that the welding is facilitated, and the electrolyte can flow after being injected. Furthermore, the baffle 5 is further provided with liquid passing holes 53, and the liquid passing holes 53 are arranged corresponding to the intervals of the second protruding parts 52 and penetrate through the baffle 5. The liquid passing hole 53 facilitates the flowing of electrolyte at the cathode end of the winding core and the discharge of air, and facilitates the injection of the electrolyte.
In one embodiment, the baffle 5 is made of an elastic metal conductive material. Specifically, the elastic metal conductive material is a copper sheet or a nickel sheet or a copper nickel-plated sheet. The guide plate 5 can generate certain deformation to adapt to the distance error between the cathode pole post 32 and the cathode current collecting disc of the roll core 4, so that the guide plate 5 is conveniently connected with the cathode pole post 32 and the cathode current collecting disc of the roll core.
For the lithium ion battery in the above embodiment, the present invention further provides an assembly method of a lithium ion battery, where the assembly method of a lithium ion battery in an embodiment includes the following steps:
s1, fixing the fixing plate 11 in one end of the shell 1 by welding or integral forming. Then, the winding core 4 is put into the other end of the housing 1, and the fixing plate 11 and the current collecting plate of the anode of the winding core 4 are welded by laser spot welding. Specifically, the current collecting disc of the anode of the winding core 4 and the fixing plate 11 are subjected to multi-point welding, so that the corresponding current collecting disc and the fixing plate 11 are stably connected, the contact and conduction area is increased, and the internal resistance of the battery is reduced.
S2, the guide plate 5 is arranged in the shell 1, and the guide plate 5 is welded and fixed on the negative current collecting disc of the winding core 4 through laser spot welding. Specifically, the guide plate 5 and the negative current collecting disc of the winding core 4 are subjected to multi-point welding. The spot welding locations are arranged around the central hole 41. So as to increase the contact and conduction area of the guide plate 5 and the negative current collecting disc of the winding core 4 and reduce the internal resistance of the battery.
And S3, mounting the cathode pole 32 on the cathode cover plate 3, mounting the cathode cover plate 3 on one end of the shell 1 far away from the fixing plate 11, and welding the guide plate 5 and the cathode pole 32 through the central hole 41 on the winding core 4 by using resistance welding. Specifically, the negative electrode cover plate 3 is welded to the case 1, and then the upper and lower electrodes of the resistance welding machine are used to clamp the deflector 5 and the negative electrode post 32 for welding. In the welding process, because resistance welding is adopted, the resistance welding machine can clamp the guide plate 5 and the cathode pole 32 tightly during welding, so that the guide plate 5 and the cathode pole 32 are firmly welded and stably conducted.
And S4, installing the positive cover plate 2 and injecting electrolyte, wherein the positive cover plate 2 is connected with the shell 1 through welding.
According to the assembling method of the lithium ion battery in the embodiment, the anode cover plate 2 and the cathode cover plate 3 do not need to be separately assembled and welded, the current collecting disc of the anode of the fixing plate 11 and the winding core 4 is welded firstly, and then the current collecting disc of the cathode of the current guide plate 5 and the winding core 4 is welded, so that the fixing plate 11 and the current guide plate 5 can be conveniently controlled to be tightly attached to the corresponding current collecting discs, and the welding quality is ensured. The guide plate 5 and the cathode pole 32 are welded through resistance welding, so that the guide plate 5 and the cathode pole 32 are tightly attached in the welding process, and empty welding is avoided. The battery assembling process is simplified, and the production efficiency is improved.
The above examples are only intended to illustrate the technical solution of the present invention, and not to limit it; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being covered by the appended claims and their equivalents.
Claims (10)
1. A lithium ion battery comprises a shell, a winding core, an anode cover plate and a cathode cover plate, and is characterized in that the shell is cylindrical with openings at two ends, a fixing plate is arranged at one end of the shell, the fixing plate is arranged in the shell close to the opening at the corresponding end, the periphery of the fixing plate is fixedly connected with the inner wall of the cylindrical barrel in a conductive manner, and a through hole is formed in the center of the fixing plate;
the positive cover plate is arranged at an opening of one end of the shell, which is provided with the fixing plate, and the positive cover plate is welded with the periphery of the corresponding opening of the shell;
the winding core is arranged in the shell, a central hole is formed in the winding core, the central hole penetrates through the current collecting discs at two poles of the winding core, and the current collecting disc at the positive pole of the winding core is welded and connected with one surface, far away from the positive pole cover plate, of the fixing plate;
the negative pole cover plate sets up the casing is kept away from the opening part of fixed plate one end, the negative pole cover plate with the casing corresponds the peripheral welded connection of open-ended, the center department of negative pole cover plate is equipped with negative pole post, negative pole post with the negative pole cover plate is insulating to be set up, negative pole post's one end is located in the casing, negative pole post's the other end runs through the negative pole cover plate is located outside the casing, negative pole post locates one in the casing is served and is equipped with the guide plate, the one side of guide plate with negative pole post welded connection, the another side of guide plate with the current collector dish welded connection of the negative pole of rolling up the core.
2. The lithium ion battery of claim 1, wherein the current plate is made of an elastic metal conductive material.
3. The lithium ion battery of claim 1 or 2, wherein a mounting hole is formed in the center of the negative electrode cover plate, and the mounting hole penetrates through the negative electrode cover plate; the negative pole post comprises a negative pole pressing plate and a conductive rivet, the negative pole pressing plate is arranged on the outer side of the negative pole cover plate, an insulating part is arranged between the negative pole pressing plate and the negative pole cover plate, an insulating sealing part is arranged on the inner side of the negative pole cover plate, and the insulating sealing part penetrates through the mounting hole and is connected with the insulating part; conductive rivet runs through in proper order insulating sealing member the mounting hole reaches the insulating member with the riveting of negative pole clamp plate, the one side of guide plate with conductive rivet welded connection, the another side of guide plate with the current collection dish welded connection of the negative pole of roll up the core.
4. The lithium ion battery of claim 3, wherein a boss is arranged on one surface of the insulating sealing member close to the negative electrode cover plate, the boss penetrates through the mounting hole and is inserted into the insulating member, the conductive rivet penetrates through one surface of the insulating sealing member far away from the negative electrode cover plate, and the end surface of one end of the boss inserted into the insulating member is connected with the negative electrode pressing plate.
5. The li-ion battery of claim 4, wherein the end of the boss inserted into the insulator has an interference fit with the insulator and the mounting hole, and the conductive rivet has an interference fit with the insulating seal.
6. The lithium ion battery of claim 3, wherein a first protrusion is disposed on a surface of the guide plate close to the conductive rivet, the first protrusion is welded to the conductive rivet, a second protrusion is disposed on a surface of the guide plate away from the conductive rivet, and the second protrusion is welded to the current collecting disc of the negative electrode of the winding core.
7. The lithium ion battery of claim 1, wherein a side of the fixing plate facing away from the positive cover plate is provided with an annular groove and a plurality of recesses, the annular groove is concentric with the fixing plate and is arranged at a joint of the fixing plate and the casing, and the recesses are arranged in an area enclosed by the annular groove and are spaced around a center of the fixing plate.
8. The lithium ion battery according to claim 7, wherein a gap is provided between the two surfaces of the positive electrode cover plate and the fixing plate which are close to each other, a liquid injection hole and a sealing cover capable of closing the liquid injection hole are provided in the positive electrode cover plate, and the recessed portion is provided through the fixing plate.
9. A method of assembling a lithium ion battery as claimed in any one of claims 1 to 8, comprising the steps of:
s1: fixing a fixing plate in one end of a shell by welding or integral forming, then putting a winding core from the other end of the shell, and welding and connecting the fixing plate and a current collecting disc of the anode of the winding core by laser spot welding;
s2: the guide plate is arranged in the shell, and the guide plate is welded and fixed on the negative current collecting disc of the winding core through laser spot welding;
s3: mounting the negative pole post on a negative pole cover plate, mounting the negative pole cover plate on one end of the shell far away from the fixed plate, and welding and connecting the guide plate and the negative pole post by using resistance welding through a central hole on the winding core;
s4: and installing a positive cover plate and injecting electrolyte, wherein the positive cover plate is connected with the shell through welding.
10. The method according to claim 9, wherein the step S3 further comprises the step of welding the negative electrode cover plate to the case, and then welding the negative electrode clamping guide plate and the negative electrode post by using upper and lower electrodes of a resistance welding machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733597.5A CN115149082A (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery and assembling method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210733597.5A CN115149082A (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery and assembling method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115149082A true CN115149082A (en) | 2022-10-04 |
Family
ID=83408793
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210733597.5A Pending CN115149082A (en) | 2022-06-27 | 2022-06-27 | Lithium ion battery and assembling method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115149082A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295860A (en) * | 2022-10-09 | 2022-11-04 | 深圳海润新能源科技有限公司 | Preparation method of secondary battery, secondary battery and battery module |
| CN117352861A (en) * | 2023-11-03 | 2024-01-05 | 惠州市前景新能源有限公司 | Preparation method of electric control type rechargeable battery |
-
2022
- 2022-06-27 CN CN202210733597.5A patent/CN115149082A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115295860A (en) * | 2022-10-09 | 2022-11-04 | 深圳海润新能源科技有限公司 | Preparation method of secondary battery, secondary battery and battery module |
| CN117352861A (en) * | 2023-11-03 | 2024-01-05 | 惠州市前景新能源有限公司 | Preparation method of electric control type rechargeable battery |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2023185501A1 (en) | High-energy-density cylindrical battery and assembly process therefor | |
| CN115149082A (en) | Lithium ion battery and assembling method thereof | |
| CN114628767B (en) | Cylindrical battery and assembling process thereof | |
| CN217035800U (en) | Multi-tab cylindrical battery | |
| CN115986335A (en) | Electrode terminal, current collecting assembly and cylindrical battery | |
| CN113871763B (en) | Cylindrical battery case, cylindrical battery, and method for mounting cylindrical battery | |
| WO2024066234A1 (en) | Cylindrical battery and assembly process therefor | |
| CN214043810U (en) | Cover plate and single battery | |
| CN217239703U (en) | High energy density cylinder type battery | |
| WO2024031988A1 (en) | Cylindrical battery | |
| CN215933777U (en) | High-rate large-capacity simple battery sealing cover and cylindrical battery | |
| CN113571848A (en) | High-rate high-capacity extremely-simple battery sealing cover, cylindrical battery and assembly process | |
| CN218867252U (en) | Battery with a battery cell | |
| CN219180634U (en) | Power battery cover plate and battery | |
| CN218039361U (en) | Lithium ion battery | |
| CN216720022U (en) | High-safety high-magnification cylindrical battery | |
| CN216958261U (en) | Battery and cap thereof | |
| CN217589185U (en) | Battery cover plate assembly and cylindrical battery | |
| CN215869707U (en) | Battery and electric vehicle with same | |
| CN114421001A (en) | High-safety high-magnification cylindrical battery and assembly process thereof | |
| CN217823180U (en) | Lithium ion cylinder electricity core negative pole mass flow body connection structure and lithium ion battery | |
| CN217823172U (en) | Lithium ion cylinder electricity core positive current collector connection structure and lithium ion battery | |
| CN217823018U (en) | Lithium ion cylinder electricity core shell and lithium ion battery | |
| CN219591462U (en) | Battery cell | |
| CN214625191U (en) | Large cylindrical lithium ion battery cover plate with liquid cooling |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |